First thing I would do is put resume s out for another place to work. Second I would talk to all the other employees and as a group, write a letter to the owner stating that according to your state s laws, you are entitled to fair pay. I understand money is tight, even for a small business. This does not excuse them for paying employees. If they can t pay everyone, then they will have to start laying people off. This would allow the laid off person unemployment benefits. This is a lot more fair than stringing them along and expecting work for free. If the company still doesn t pay, you might have to send a letter to your state s labor board.
Just keep the communications lines open and follow up with your employer till they have paid you in full. In the mean you should consider looking for a new job as it sounds like your current employer is about to go under. For most businesses bouncing payroll checks is the very last thing they want to do. So in my opinion they are probably on their last leg.
contact your local employee rights agency they will get your money for you and others your employer is breaking the law and will lose thier license and business if they fire you becue of seeking justice wooooooooooo boy they really are in trouble with the fedral agencies